/**
* Calculate, based on given RubyModule, which class in its hierarchy should be used to determine
* protected access.
*
* @param cls The class from which to calculate
* @return The class to be used for protected access checking.
*/
protected static RubyModule calculateProtectedClass(RubyModule cls) {
// singleton classes don't get their own visibility domain
if (cls.isSingleton()) cls = cls.getSuperClass();
while (cls.isIncluded()) cls = cls.getMetaClass();
// For visibility we need real meta class and not anonymous one from class << self
if (cls instanceof MetaClass) cls = ((MetaClass) cls).getRealClass();
return cls;
}
